sext1 Syllabification: (sext)Pronunciation: /sekst/Definition of sext noun a service forming part of the Divine Office of the Western Christian Church, traditionally said (or chanted) at the sixth hour of the day (i.e., noon). Origin: late Middle English: from Latin sexta (hora) 'sixth (hour)', from sextus 'sixth'sext in other Oxford dictionaries Definition of sext in the British & World English dictionary